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anorthositic

 - 3 dictionary results

an⋅or⋅tho⋅site

  [an-awr-thuh-sahyt]
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–noun Petrology.
a granular plutonic rock composed largely of labradorite or a more calcic feldspar.
Origin:
1860–65; < F anorthose anorthoclase (an- an- 1 + Gk orthós straight) + -ite 1

Related forms:
an⋅or⋅tho⋅sit⋅ic  [an-aw-thuh-sit-ik] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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an·or·tho·site   (ān-ôr'thə-sīt')   
n.  A variety of diorite consisting chiefly of feldspar.

[French anorthose, a kind of feldspar (Greek an-, not; see a-1 + Greek orthos, straight) + -ite1.]
an·or'tho·sit'ic (-sĭt'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
anorthosite   (ān-ôr'thə-sīt')  Pronunciation Key 
An igneous rock consisting almost entirely of plagioclase feldspar, especially the labradorite variety. Anorthosites have been identified among rock samples collected from the Moon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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